How to write an image file in internal storage in android?

This example demonstrates How to write an image file in internal storage in android.

Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.

Step 2 − Add the following code to res/layout/activity_main.xml.

<?xml version = "1.0" encoding = "utf-8"?>
<LinearLayout xmlns:android = "https://schemas.android.com/apk/res/android"
xmlns:tools = "https://schemas.android.com/tools"
android:layout_width = "match_parent"
android:layout_height = "match_parent"
tools:context = ".MainActivity"
android:orientation = "vertical">
<Button
android:id = "@+id/save"
android:text = "save"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content" />
</LinearLayout>

In the above code, we have taken a button. When user click on button, It will store data in internal storage.

Step 3 − Add the following code to src/MainActivity.java

package com.example.andy.myapplication;
import android.content.Context;
import android.content.ContextWrapper;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import java.io.File;
import java.io.FileOutputStream;
public class MainActivity extends AppCompatActivity {
   Button save;
   Bitmap bitmap;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      Drawable drawable = getResources().getDrawable(R.drawable.mario);
      bitmap = ((BitmapDrawable) drawable).getBitmap();
      save = findViewById(R.id.save);
      save.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
            ContextWrapper cw = new ContextWrapper(getApplicationContext());
            File directory = cw.getDir("imageDir", Context.MODE_PRIVATE);
            File file = new File(directory, "UniqueFileName" + ".jpg");
            if (!file.exists()) {
               Log.d("path", file.toString());
               FileOutputStream fos = null;
               try {
                  fos = new FileOutputStream(file);
                  bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
                  fos.flush();
                  fos.close();
               } catch (java.io.IOException e) {
                  e.printStackTrace();
               }
            }
         }
      });
   }
}

Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click Run icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen -

In the above result, click on save button to store image in internal storage as shown below –